Method and apparatus for making paper



A. E. COFRIN METHOD AND APPARATUS FOR MAKING PAPER Original Filed Aug. 13 1925 ApriS, I p v 4 UNITED. s rl\""r |-:s i a'rlaiw'r OFFICE. 1

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A: It is a further object of the invention to Q the parting of the'surface of the tube. roll from the wire at the the surface of the roll, of the usual diameter,

mnrnon AND APPARATUS FOR MAKING 1mm h i'plicatienflled August 13, 1925,'Serial No. 50,121. ne'newed May 24, 192s.

.. The invention relates to paper making machines of the =Fourdrinier t'y-pe, a'nd has as 'an-object the provision of means for re-.

moving the water from the pulp upon the wire after leaving the breast roll, ln'such a manner as to cause the fibers of the pulpto gather" into a sheet' more quickly and to produce a better product. It is a further objecto enable a machine of this type to be run at a much greater speed than has heretofore been possible, when producing tissue paper.

provide means, of the nature referred to,

,perior to that heretofore produced, even oughthe machine is run at a greatly 111- creased-speed' o,-

n It is a further Ob ectf'the invention .tov

provide an. improved method .'of""making f the invention 'to T wire over ea .u ushy product.

such that the finished product will bes11.-

papenparti'cularlydirected to the step of,

removing moisture from the pulp carrying member, as the Fourdrinier wire;

Further objects'of the invention will appear fromthe accompanying drawing sho'wing a diagrammatic side elevation of the Fourdrinier'portion of a paper making ma:

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chine. f

.. The substantiall universal prmi e ni 17. Vacuum boxes are shown at 18, 19.

are 'known as tube rolls, over which t e wire runs immediately adjacent to the breast roll.

thus hasten the drying? of; the film of pulp, K Tdecreasing" percent e] of fibre passes It has been the accepted. theory in thistype -*of imachine that these tube rolls draw the water from the lowerl 'side' of the wire and through the wire withthejwater as the film vbeco'n'ie's felted'toge'thergi' 4 I have found that theltube rolls ddnot function exactlyas has been supposed; The" water which asses-through the wire 'immediately after eavin the breast roll contains nearly as much of t-e fibre as does the material remainin uponthe upper surface of the wire, the w ole of the material at this this speed mottled porous "appearance;

The tubes of the usual size revolving at give a high centrifugal velocity to the water and fibres-.coming in contact therewith, which results throwing the Water back through the Fourdrinier wire, thereby upsetting the. forming film upon the wire and tending to keep up the percentage of fibre passing through with the. water. Thisaction, in a gradually decreasing amount, takesplace at the passage of the ch tube roll andresults in a,

.In addition to thi saction pf'the tube rolls,

angle formed between "and the wire, produces a suction effect upon' the film carried by the wirefto again produce 'manufacturing very thin tissue paper, has

been 'a tissue paper which has a mushy or In a machine embodying the invention as shown .in the diagrammatic view of the drawing, there is indicated a Fourdrinierf wire belt 10, a breast roll 11,- couch rolls 12 and 13, and tensionrollers 14 and15. An

apron-board is shown at 16 and a slice 'at flat upper surfaces along which the wire travels in contact therewith.

As showm'the leading edges 21 of the bars are formed at rigl'it angles to" the wire.- This angle may ,be varied to some extent,';

but'it is preferable to provide a sharp angle at thejuncture of the edges 21 and the upper surfaces of the bars 20.

fwith the angle of the bars 20 successively is point comprising substantially 95% [watery A heavy fil-m of water-and fibre'is threfore present upon the lower sideof' the wire when the first tube roll is reached, which;

tube roll is revolving at the velocity of thewire. The usual speed of travel of the wire in machines of this type in them-aking of tissue paper has be en substantially 600 feet per minute.

stripped oifwithout causing any disturbance upon the upper surface of the wire. The

i The film of water and pulp carried by the 4 a lower surface of the bars coming in contact thus equipped to produce tissue papers at speeds which have formerly been available in the manufacture of news print paper, the tissue paper thus produced being. superior to that produced heretofore.

Minor changes may be made in the physical embodiment of the invention without departing from the spirit.

I claim:

1. In 'a Fourdrinier machine, the combination of a traveling wire, means for feeding pulp. to said wire, means to remove moisture from the lower side of said wire by contact with the moisture, said means precipitating the moisture on the contactsidethereof.

2. In a Fourdrinier machine, the combination of .a traveling wire, means for removing moisture from the forming film upon said wire, comprising a series offlat surfaces closely adjacent the lower side of said wire and adjacent the feed end of the machine.

3. In a Fourdrinicr machine, the combination of a traveling wire, means for feedingpulp to said wire, means for removing moisture from the lower surface of said wire comprising a bar having a flat upper surface over which the wire passes, and an edge facing said feeding means and joining said surface at an abrupt angle.

&. In a Fourdrinier machine, the-combination of a breast roll, a traveling wire passing about said roll, means for feeding pulp to said wire, and means for removing moisture from the lower side of said wire comprising a plurality of stationary bars hav ing plane upper surfaces in contact with said wire and edges facing toward said breast roll joining said respective surfai-cs at abrupt angles.

5. In a'Fourdrinier machine, the combination of a breast roll, a travcling'wire passing about said roll, means for feeding pulp to said wire, means for removing water from said pulp comprising a plurality of bars having flat upper surfaces over which said wire passes and having edges facing said roll Joining said surfaces in abrupt angles not greater than a right angle.

AUSTIN E. COFRIN. 

